Efforts to legalize professional mixed martial arts in New York have floundered again with the state Assembly’s Democratic leaders refusing to allow a vote on the measure.

The bill, passed by the Senate earlier this year, had 63 sponsors in the 150-member Assembly. Gov. Andrew Cuomo says he’s not opposed.

Michael Whyland, spokesman for the Assembly Democratic Conference, says there was not enough support within the conference.

New York remains the last state to prohibit the sport after Connecticut approved similar legislation. The bill has stalled in the Assembly — without going to a vote — the last five years.

Backers, saying they remain undeterred, argue that it’s already widely seen on television in New York and practiced in gyms around the state, including unregulated amateur competitions. MMA shows, like those from powerhouse UFC, a billion-dollar organization, would generate millions from the state.

The bill would legalize and regulate MMA at the professional and amateur levels.

Opponents say it promotes and glamourizes violence.

“While our disappointment cannot be overstated, our commitment to seeing New York legalize the fastest growing sport in the nation and the world is intact and undeterred,” said Lorenzo Fertitta, CEO of the UFC. “We continue to strongly believe that legalizing and regulating MMA in New York is the right thing for the state economically, the right thing for the millions of fans in New York and the right thing for the safety and benefit of the thousands of professional and amateur MMA athletes across the state.